-al -ol a-a a-b a-c aaa aab aac aaf aah aal aao aar ab- aba abb abc abf abh abl abo abr ac- aca acb acc acf ach acl aco acr af- afa afb afc aff afh afl afo afr aha ahb ahc ahf ahh ahl aho ahr al- ala alb alc alf alh all alo alr aoa aob aoc aof aoh aol aoo aor ar- ara arb arc arf arh arl aro arr baa bab bac baf bah bal bao bar bba bbb bbc bbf bbh bbl bbo bbr bca bcb bcc bcf bch bcl bco bcr bfa bfb bfc bff bfh bfl bfo bfr bha bhb bhc bhf bhh bhl bho bhr bla blb blc blf blh bll blo blr boa bob boc bof boh bol boo bor bra brb brf brh brl bro brr c-- caa cab cac caf cah cal cao car cba cbb cbc cbf cbh cbl cbo cbr cca ccb ccc ccf cch ccl cco ccr cfa cfb cfc cff cfh cfl cfo cfr ch- cha chb chc chf chh chl cho chr cl- cla clb clc clf clh cll clo clr co- coa cob coc cof coh col coo cor cra crb crc crf crh crl cro crr faa fab fac faf fah fal fao far fba fbb fbc fbf fbh fbl fbo fbr fca fcb fcc fcf fcl fco fcr ffa ffc fff ffh ffl ffo ffr fha fhb fhc fhf fhh fhl fho fhr fla flb flc flf fll flo flr foa fob foc fof foh fol foo for fra frb frc frf frh frl fro frr haa hab hac haf hah hal hao har hba hbb hbc hbf hbh hbl hbo hbr hca hcb hcc hcf hch hcl hco hcr hfa hfb hfc hff hfh hfl hfo hfr hha hhb hhc hhf hhh hhl hho hhr hla hlb hlc hlf hlh hll hlo hlr hoa hob hoc hof hoh hol hoo hor hr- hra hrb hrc hrf hrh hrl hro hrr la- laa lab lac laf lah lal lao lar lba lbb lbc lbf lbh lbl lbo lbr lca lcb lcc lcf lch lcl lco lcr lfa lfb lfc lff lfh lfl lfo lfr lha lhb lhc lhf lhh lho lhr lla llb llc llf lll llo llr loa lob loc lof loh lol loo lor lra lrb lrc lrf lrh lro lrr oaa oab oac oaf oah oal oao oar ob- oba obb obc obf obh obl obo obr oc- oca ocb occ ocf och ocl oco ocr of- ofa ofb ofc off ofl ofo ofr oha ohc ohf ohh ohl oho ohr ola olb olc olf oll olo oo- ooa oob ooc oof ooh ool ooo oor or- ora orb orc orf orh orl oro orr ra- raa rab rac raf rah ral rao rar rba rbb rbc rbf rbh rbl rbo rbr rca rcb rcc rcf rch rcl rco rcr rfa rfb rfc rff rfh rfl rfo rfr rh- rha rhb rhc rhf rhh rhl rho rhr rla rlc rlf rlh rll rlo rlr roa rob roc rof roh rol roo ror rra rrb rrc rrf rrh rrl rrr